Snap-switch.



' G. ROTH.

SNAP SWITCH. APPLIGATION FILED 001'. 2B, 1913.

1,1 1%,1 61. I I Patented Sept. 29, 1914.

Z SHEETSSHEET 1.

C. ROTH.

SNAP SWITCH.

APPLICATION FILED OCT. 28, 1913. 1, 1 12, 1 61 Patented Sept. 29, 1914.

2 8HEETS-SHEET 2;

8 vwe wtpz UNITED srra'rns PATENT orricn.

CHARLES ROTH, or BROOKLYN, NEW YORK, ASSIGNOR TO THOMAS E. MURRAY, on

NEW YORK, N. Y.

SNAP-SWITCH.

Specification of Letters Patent.

Pate11tedSept.,29, 1am.

Application filed October 28, 1913. Serial No. 797,724.

To all whomit may concern:

Be it known that I, CHARLES Born, a citizen of the United States, residin at Brooklyn, in the county of Kings and btate of New York, have invented a certain new and useful Improvement in Snap-Switches, of which the following is a specification.

The invention is a spring-actuated snap switch, so constructed that the manual turning of a shaft first energizes the spring and then removes a movable dog which prevents said spring from throwing the lever. The dog after release follows the edge of a cam plate over an arc of 180 and is again arrested by a straight edge of said plate, and upon being released a second-time follows a similar and opposite semicircular edge back to another straight edge, and so regains its normal position. nism thus controlled moves the lever altcrnately into and out of cooperative relation with fixed contacts.

In the accompanying drawings Figure 1 is a plan view of a fuse-carrying snap switch illustrating my invention. Fig. 2 is a section on line 12 2 of Fig. 1. Fig. 3 is a section on line a", at of Fig. 1. Figs. 4, 5, 6 and 7. are enlarged detail views of the switch mechanism. Fig. 41 is a section on line 2, z of Fig. 7. Fig. 5 is a section on line w, m of Fig. 7, with the guide-plate 7 broken away to show the pinion 18 and rack teeth on plate 15, and also exhibiting the dog 19 in ci'igageinent with the straight edge A of rain-plate 15. Fig. 6is a. view similar to Fig. 5, but showing the position of the parts when the dog 19 is following semicircular cam edge C. Fig. 7 is a section on line 2 y of Fig. 5.

Similar numbers and letters of reference indicate like parts.

The shaft 1 is journaled in two standards 5 and 4. within the inclosing box 5, and exicnds through a. wall of said box, outside of which it has an operating handle 6. Loose upon said shaft is a guide-plate 7 having longitudinal side flanges 8 on one face. and transverse end flanges 9 oirthc other facc. The ends of two metal bars 10, 11 are secured in openings iii-flanges 9. Said bars extend parallel to shaft 1 on opposite sides tl'iereof and are connected by a cross piece 13, Fig. 2, loose on shaft 1 A helical spring 12 surrounding shaft 1 is connected The switch lever meehaat One end to said shaft, and at the other end to'guide-plate' 7.

Fast upon standard 3 is a cam-plate 1% having two straight edges A, B, and two semicircular edges C, D: Between this camplate and the guide-plate 7 and having its edges sliding against the flanges 8' of said guide-plate 1s a dog-plate 15. Said plate has an elongated longitudinal slot 16, upon one longitudinal edge of which are formed rack teeth 17.. A mutilated pinion 18 fast on shaft 1 is in slot 16, and the teeth of said pinion engage said rack teeth.

Upon one end of plate 15 is a do 19. The expansive force of spring 12 ten s to rotate guidc-plate 7 upon shaft 1, and hence also dog-plate 15 which slides in the recess formed by flanges 8 on plate 7. lVhen the dog is in, contact with a straight edge A or B of fixed cam-plate 14, said edgeacts as a stop to prevent. such rotation, until the dog is moved outward along said edge to clear the same.

The parts being as shown in Fig. 5, with the dog lying in the angle between straight edge A and semicircular edge C of cam plate 14, the rotation of shaft 1 in the direction of arrow (1. by means of handle 6 causes pinion 18 to move plate 15 so as to cause said dog to travel radially rmtward along straight edge A. At the same time, the rotation of shaft 1 winds up and so energizes spring 12. As soon as dog 19 clears straight edge A, the energized spring 12 is free to rotate plate 7. The dog then follows the sranicircular edge I) of canrplate 1 1 until it meets edge B, which arrests its furthcr movement.

To bring back the parts to the position of Fig. same direction by handle 6. The dog their travels along edge B'and clears the same, the spring 12 being again wound as before. The dog then follows semicircular edge 9'; as shown in Fig. 6, until arrested by edge A. The guide-plate 7 and bars 10, 11 secured thereto are, therefore, arrested twice during their rotation around shaft 1 at points 180 apart. It will be obvious, therefore, that if a switch lever be secured to bars 16, 11 to project at a right angle thereto. and a contact be disposed in the circular path of said lever, said lever may by rotating shaft 1. be moved into and out of coiiperation with position.

said contact, and will come to rest in each This will be clearly apparent from Figs. 1, 2 and 3, in which I have illustrated my switch applied to they insertion and removal of a fuse plug, cooperating with apair of fixed contacts in the box 5. in said box and between the standards 3, 4 is a block of insulating material having a channel in its upper side. In said channel and against the walls thereof are secured twov contact plates 21, 22. To contact plate 21 is connected the circuit lead 23, and to contact plate 22 is connected the circuit lead 2%. The fuse plug 25 carries the fuse strip 26 which is doubled over -'one edge of said plug and is broadened to cover the opposite sides thereof, so that when said plug is placed between the contact plates 21, 22, circuit is established through said strip. The body portion of the plug. has an opening which receives a right-angled lever arm 27 which is fast upon the bars 10,11. hen said fuse plug is in eontact-closing position between the plates 21, 22, it stands horizontally and below the shaft 1, as shown in Fig. 3. When shaft 1 is turned to rotate guideplate 7 180, as described, the plug 25 is lifted by arm. 27 out of the contacts 21, 22, and by the quick action of spring 12 is car- 30- ried into the reverse position 180 distant plate facing said guide-plate, a dog-plate having a longitudinal slot'receiving said shaft disposed between the side flanges of said guide-plate and between said guideplate and said cam-plate and having rack teeth on an edge of said slot, a pinion on said shaft within said slot and engaging said rack teeth, a dog on said dog-plate cooperating with the edge of said cam-plate, a cross bar loose on said shaft, bars extending from said cross bar parallel to said shaft and secured at their ends to said guide-plate, a switch lever secured to said bars, and contacts cooperating with said lever.

In testimony whereof I have affixed iny signature in presence of two witnesses.

CHARLES ROTH. Witnesses GERTRUDE T. PORTER, MAY '1. MeGAnnY. 

